As4K4O8
As4K4O8 is a thermodynamically stable, wide-band-gap insulating compound containing arsenic, potassium, and oxygen.
About As4K4O8
As4K4O8 is a complex inorganic compound composed of arsenic, potassium, and oxygen. As a thermodynamically stable phase residing on the convex hull, it represents a robust structural arrangement that is of significant interest for fundamental solid-state research.
Characterized as a wide-band-gap insulator, this material exhibits electronic properties typical of stable oxides where valence electrons are tightly bound. Its presence across multiple structural databases highlights its importance as a well-defined crystalline entity in the broader landscape of arsenic-based chemistry.
Key Properties
Cross-validated computational properties for As4K4O8, aggregated across 3 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for As4K4O8, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| Pbcm (No. 57) | orthorhombic | 3.84 | 0.0000 | -5.810 | 3.37 |
| — | — | — | — | — | 2.91 |
| Pbcm (No. 57) | — | — | — | — | — |
| — | — | — | — | — | 2.69 |
| — | — | — | — | — | 2.91 |
Frequently Asked Questions
Common questions about As4K4O8, answered from cross-validated data.
What is As4K4O8?
As4K4O8 is a thermodynamically stable, wide-band-gap insulating compound containing arsenic, potassium, and oxygen.
What is the band gap of As4K4O8?
Is As4K4O8 a metal, semiconductor, or insulator?
Is As4K4O8 thermodynamically stable?
What is the crystal structure of As4K4O8?
What is the density of As4K4O8?
How many polymorphs of As4K4O8 are known?
What elements does As4K4O8 contain?
Where does the data for As4K4O8 come from?
How It Compares
As a unique inorganic compound, As4K4O8 serves as a distinct representative of its chemical family. Because it occupies a thermodynamically stable position, it provides a reliable benchmark for studying the structural and electronic behavior of potassium-arsenic-oxygen systems.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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